Defense Tech reports that one of the T-50s was forced to abort it's takeoff due to a flame-out in the left engine. The Sukhoi has blamed cause of the flame-out on a malfunctioning fuel supply, but Russian runways are notorious for having pieces of metal on them that can cause a flame-out. Flightglobal corespondent Vladimir Karnozov was there and witnessed the flame-out, and Stephen Trimble posted his report over at the DEW Line.
As a bonus here is a video of the Su-35.
Photo Credit: Defense Tech
Video Credit: SAMTOMAS, Typhoon USSR